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<TITLE>Scheme 48 Manual -- Command processor</TITLE>

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<EM>Scheme 48 Manual</EM> | <A HREF="s48manual.html#top_node">Contents</A> | In Chapter: <A HREF="s48manual.html">Top</A><BR>Previous: <A HREF="s48manual_10.html">Library</A> | Next: <A HREF="s48manual_12.html">Current focus value and <TT>##</TT></A>
<H1>Command processor</H1>

<P>This chapter details Scheme&nbsp;48's command processor, which incorporates
 both a read-eval-print loop and an interactive debugger.
At the <CODE>&gt;</CODE> prompt, you can type either a Scheme form
 (expression or definition) or a command beginning with a comma.
In
<A HREF="s48manual_18.html">inspection mode</A>
 the prompt changes to <CODE>:</CODE> and commands
 no longer need to be preceded by a comma; input beginning with
 a letter or digit is assumed to be a command, not an expression.
In inspection mode the command processor prints out a
 menu of selectable components for the current object of interest.
<P><MENU>
<LI><A HREF="s48manual_12.html">Current focus value and <TT>##</TT></A>
<LI><A HREF="s48manual_13.html">Command levels</A>
<LI><A HREF="s48manual_14.html">Logistical commands</A>
<LI><A HREF="s48manual_15.html">Module commands</A>
<LI><A HREF="s48manual_16.html">Debugging commands</A>
<LI><A HREF="s48manual_17.html">Switches</A>
<LI><A HREF="s48manual_18.html">Inspection mode</A>
<LI><A HREF="s48manual_19.html">Command programs</A>
<LI><A HREF="s48manual_20.html">Building images</A>
<LI><A HREF="s48manual_21.html">Resource query and control</A>
<LI><A HREF="s48manual_22.html">Threads</A>
<LI><A HREF="s48manual_23.html">Quite obscure</A>
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